Assembly comprising a rotary wheel made of a non-magnetic material and a bearing provided with a cone

Abstract

An assembly (10), in particular fora timepiece, including a rotary wheel and a bearing, like a jewel (20), the rotary wheel being provided with at least one pivot (17) including at least partly a non-magnetic material, preferably entirely, the bearing including a face (6) provided with a hole (8) formed in the body of the bearing and with a functional geometry at the entrance of the hole (8), wherein the functional geometry has the shape of a cone (12), and wherein the non-magnetic material of the pivot (17) includes an alloy to be chosen from materials containing copper, materials containing palladium or materials containing aluminium.

1 . An assembly ( 10 ) for a timepiece, comprising a rotary wheel and a bearing, including a jewel ( 20 ,  30 ), the rotary wheel being provided with at least one pivot ( 17 ) including at least partly a non-magnetic material, the bearing including a face ( 6 ,  26 ) provided with a hole ( 8 ,  28 ) formed in the body of the bearing and with a functional geometry at the entrance of the hole ( 8 ,  28 ), wherein the functional geometry has the shape of a cone ( 12 ,  22 ), and wherein the non-magnetic material of the pivot ( 17 ) comprises an alloy to be chosen from materials containing copper, materials containing palladium, or materials containing aluminium. 
     
     
         2 . The assembly, according to  claim 1 , wherein the non-magnetic material has a Vickers hardness of less than 500 HV, preferably less than 450 HV, or even less than 400 HV. 
     
     
         3 . The assembly, according to  claim 1 , wherein the non-magnetic material is an alloy containing copper of the CuBe2 type. 
     
     
         4 . The assembly, according to  claim 1 , wherein the non-magnetic material is an alloy containing palladium comprising by weight:
 between 25% and 55% of palladium,   between 25% and 55% of silver,   between 10% and 30% of copper,   between 0.5% and 5% of zinc,   gold and platinum with a total percentage of these two elements between 5% and 25%,   between 0% and 1% of one or more elements chosen from boron and nickel,   between 0% and 3% of one or more elements chosen from rhenium and ruthenium,   at most 0.1% of one or more elements chosen from iridium, osmium and rhodium, and   at most 0.2% of other impurities, the respective quantities of the components being such that added together, they reach 100%.   
     
     
         5 . The assembly, according to  claim 4 , wherein the non-magnetic material is an alloy comprising by weight: between 30% and 40% of palladium, between 25% and 35% of silver, between 10% and 18% of copper, between 0.5% and 1.5% of zinc, and the alloy comprises by weight gold and platinum with a total percentage of these two elements between 16% and 24%. 
     
     
         6 . The assembly, according to  claim 5 , wherein the non-magnetic material is an alloy comprising by weight:
 between 34% and 36% of palladium,   between 29% and 31% of silver,   between 13.5% and 14.5% of copper,   between 0.8% and 1.2% of zinc,   between 9.5% and 10.5% of gold,   between 9.5% and 10.5% of platinum,   at most 0.1% of one or more elements chosen from iridium, osmium, rhodium and ruthenium, and   at most 0.2% of other impurities, the respective quantities of the components being such that added together, they reach 100%.   
     
     
         7 . The assembly, according to  claim 1 , wherein the non-magnetic material is an alloy containing palladium comprising by weight:
 between 25% and 55% of palladium,   between 25% and 55% of silver,   between 10% and 30% of copper,   between 0% and 5% of zinc,   between 0% and 2% of one or more elements chosen from rhenium, ruthenium, gold and platinum,   between 0% et 1% of one or more elements chosen from boron and nickel.   
     
     
         8 . The assembly, according to  claim 7 , wherein the non-magnetic material is an alloy comprising by weight between 38% and 43% of palladium, between 35% and 40% of silver, between 18% and 23% of copper, and between 0.5% and 1.5% of zinc. 
     
     
         9 . The assembly, according to  claim 1 , wherein the non-magnetic material is an alloy containing aluminium comprising by weight:
 between 83% and 94.5% of aluminium,   between 4% and 7% of zinc,   between 1% and 4% of magnesium,   between 0.5% and 3% of copper,   between 0% and 3% of one or more elements chosen from chromium, silicon, manganese, titanium and iron.   
     
     
         10 . The assembly, according to  claim 9 , wherein the non-magnetic material is an alloy comprising by weight:
 between 87.32% and 91.42% of aluminium,   between 5.1% and 6.1% of zinc,   between 2.1% and 2.9% of magnesium,   between 1.2% and 2% of copper,   between 0.18% and 0.28% of chromium,   between 0% and 0.4% of silicon,   between 0% and 0.3% of manganese,   between 0% and 0.2% of titanium, and   between 0% and 0.5% of iron.   
     
     
         11 . The assembly, according to  claim 1 , wherein the jewel ( 20 ,  30 ) comprises Al2O3 alumina or ZrO 2  zirconia. 
     
     
         12 . The assembly, according to  claim 1 , wherein the jewel ( 20 ,  30 ) comprises an upper face ( 5 ,  25 ) and a lower face ( 6 ,  26 ), the lower face ( 6 ,  26 ) including the cone ( 12 ,  22 ). 
     
     
         13 . The assembly, according to  claim 1 , wherein the hole ( 8 ,  28 ) is a through-hole, in such a way as to connect said cone ( 12 ,  22 ) to the upper face ( 5 ,  25 ) of said jewel ( 20 ,  30 ). 
     
     
         14 . A timepiece comprising an assembly ( 10 ) according to  claim 1 .